[patch] Robustify get_ref_base_and_extent and friend

[Eric Botcazou]

Hi,

we're having issues with get_ref_base_and_extent overflowing the offset and 
thus returning bogus big negative values on 32-bit hosts.  The attached patch 
converts it to double ints like get_inner_reference.  It also contains a small 
fix for build_user_friendly_ref_for_offset that can stop if a field has again 
too big an offset.

Tested on x86_64-suse-linux and i586-suse-linux, OK for mainline?


2012-05-30  Eric Botcazou  <ebotcazou@adacore.com>

	* tree-dfa.c (get_ref_base_and_extent): Compute the offset using
	double ints throughout.
	* tree-sra.c (build_user_friendly_ref_for_offset) <RECORD_TYPE>:
	Check that the position of the field is representable as an integer.


-- 
Eric Botcazou
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